- Hair Care Professionals, Middlefield
- Hamburger Restaurants, Middlefield
- Hardware Stores, Middlefield
- Hardwood Floors, Middlefield
- Harness, Saddles & Supplies, Middlefield
- Health & Fitness Program Consultants & Trainers, Middlefield
- Health & Medical, Middlefield
- Health And Medical Centers, Middlefield
- Health Care Information & Services, Middlefield
- Health Clubs & Gymnasiums, Middlefield
- Health Insurance, Middlefield
- Healthcare Providers, Practitioners & Professionals, Middlefield
- Hearing Aid Repair, Middlefield - Hearing Devices
- Hearing Aids & Assistive Devices & Supplies, Middlefield - Hearing Devices
- Heating & Air Conditioning Equipment, Parts & Supplies, Middlefield - HVAC Suppliers & Companies
- Heating & Plumbing Supplies Stores, Middlefield
- Heavy Haul Trucking Companies, Middlefield - Heavy Equipment & Machinery Hauling & Transportation
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- Highway & Street Construction Contractors, Middlefield - Road Construction
- Highway Surfacing & Paving Contractors, Middlefield - Pavers - Paving Companies
- Historical Organizations, Middlefield
- Historical Societies, Middlefield
- Home Additions & Remodeling Contractors, Middlefield - Refinishing & Restoration
- Home Appliance Repair, Sales & Services, Middlefield
- Home Decor Stores, Middlefield - Home Decorations, Supplies & Accessories
- Home Furnishings, Middlefield - Home Decor Stores, Items & Accessories
- Horse Stables, Middlefield
- Hospitals, Middlefield
- Hot Dog Restaurants, Middlefield
- House & Apartment Cleaning, Middlefield
- House & Building Washing & Maintenance Exterior, Middlefield
- Household & Commercial Appliances Stores, Middlefield
- Household Goods & Furniture Storage , Middlefield
- Hydraulic Equipment & Supplies, Middlefield
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